June, '15[ GILLETTE: RHOPALOSIPHUM HIPPOHaES KOCH 



375 



sent infested twigs. It appeared that the scale had been checked 

 severely in those localities. 



In 7 cases samples sent in contained no sound eggs beneath the 

 scales. Here it was clear that the insect had not recovered from the 

 check received in the winter of 1911-1912, since no indications of life 

 were present 3 years later. 



However, in 24 localities, sound eggs were present beneath the 

 scales. This is in striking contrast to the previous report. In certain 

 counties in northern Iowa where the insect had been apparently wiped 

 out, according to scales examined 2 years before, were now (January, 

 1915) well infested with scales containing sound eggs in abundance. 

 In 2 years the condition had returned, in these localities, to one similar 

 to that immediately previous to the' winter of 1911-1912. 



CONFUSION OF RHOPALOSIPHUM HIPPOHAES KOCH,i 

 AND MYZUS BRAGGII GILLETTE 



By C. P. Gillette, Ft. Collins, Colorado. 



Rhop. hippohces Koch. 



Rhop. hippohoBs Koch. — Pflanzenlause, Aphiden, p. 28, 1854. 

 Phorodon galeopsidis Pass. — Aphidse ItaUcse, 1860. 



Phorodon galeopsidis Kali. — Buckton, Monograph British Aphididse, V, I, p. 171, 

 1876. 



Rhop. hippohces Kalt.: — Schouteden, Catalogue des Aphides de Belgique, 1905, p. 

 235. 



Myzus eloeagni, del Guercio: — Davis, Annals Ent. Soc. of Am., V, 1, p. 251, 1908. 

 Phorodon galeopsidis Kalt.: — Davis, Jour, Econ. Ent., p. 325 and 331, 1911. 



I believe the preceding bibliography and synonomy and the follow- 

 ing brief discussion of the literature upon the above species will help 

 to straighten a rather bad tangle in aphid literature. 



Koch took his Rhopalosiphum hippohces from the shrub Hippohce, in 

 the month of June. It happens that this plant serves as the over 

 winter host for both the species under discussion and Koch, both in 

 his descriptions and his figures, gives the alate form of hippohces and 

 the apterous form of braggii, or a closely alKed species, which is not at 

 all strange, as these two species are remarkably alike in coloration and 

 general appearance. 



Kaltenbach took his Aphis galeopsidis from species of Lamium, 

 Polygonum and Stachys during September, which are the summer 

 hosts. The apterous lice had capitate hairs and both apterous and 



^ This species probably belongs in the new genus Capitophorus Van der Goot. See 

 Zur Systematic der Aphiden, p. 84, 1913. 



